为什么分支从分支导致树冲突？

Question

为什么从分支创建分支会导致合并中的后续树冲突？

不应该知道mergeinfo是否足以知道不要尝试合并使用trunk保持分支最新的提交？

例如，如果我执行以下操作，则会发生冲突：

trunk 
Create branchA from trunk 
Create branchB from trunk 
Create branchC from trunk 

Make changes to branchA

Add jar to branchC

Merge branchC to trunk 

Add file to branchB 
Update branchB from trunk 

Update branchA from trunk 

Create Integration from branchA 
Merge in branchB
--tree conflict incoming add on existing jar

但是，如果我这样做，我就不会发生冲突：

trunk 
Create branchA from trunk 
Create branchB from trunk 
Create branchC from trunk 

Make changes to branchA

Add jar to branchC

Merge branchC to trunk 

Add file to branchB 
Update branchB from trunk 

Update branchA from trunk 

Create Integration from trunk
Merge in branchA    
Merge in branchB
--no conflict

我可以发布蝙蝠文件，证明这有助于澄清。